Operating mechanism for oscillatory ignition-machines.



Rf WAGNER. y OPERATING MEGHNISMFOR OSCILLATORY IGNITION MACHINES.

APPLICATION FILED DEU. 1B, 1912.

Patented Jan. 5, 1915.

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R. WAGNER.

OPERATING MBCHANISM POB osGILLAToNY IGNITION MACHINES.

APPLICATION FILED DEO.16, 1912. 1,123,436. Patented L'u1 .5,1)15.

2 BEEETB-SHEET 2.

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ma@ u w/// F M/ITIJSSES www cllatory member of the i UNITED STATES APATENT oEEIoE.

ROBERT WAGNER, or eTnT'rleAnT,v GERMANY, Assioma To THE rima or noBEBT 1 BOSCH, or STUTTGART, GERMANY v OPERATING HEC'HNIBI! lFOB OSCILLATOBY IGNITION-MACHINES.

Y Specification of Letters Patent.

Patented aan. 5, 1915.

Appnemon sued December 1e. 1m. serial ne. nanas.

The present invention relates to operating' mechanism for oscillating a movable member of an ignition machine to produce `sparking voltages for igniting the combustible gases in. internal combustion engines, .and more particularly to mechanism of this .kind in which the energy stored in. th'espring is operatively transmitted therefrom to the osgnition machine through a rolling contact 1n contradistinction' to a sliding contact.

According to the invention,'.the operating spring is connected to the operating lever by an intermediate member capable of .movement relatively to its guide or support by a pure rolling motion. The intermediate member is provided with a shaped-surface held by the spring in constant engagement with a shaped-surface of an abutment, and is pii-otcd to the operating .lever in auch manner that the sliding movement at this' pivot, resulting from the deflection of the operating lever. does not interfere with the pure rolling motion on the guide. Furthermore, thearrangement is such that the stress transmitted to or from the operating spring is in substantially a Lconstant direction throughout substantially the entire deflection of the operating lever. The provision v of an intermediate member between the oprating lever and the operating spring is also advantageous in that the variation of turning moment-exerted on the oscillatory member of the ignition machine maybe graduated as desired. either by altering the contour of the rolling surfaces or by altering the ratio of the effective lengths of the operating lever' and the intermediate member. In this way. any desired part of the rolling Contact surface can be used, or the rapid variation of turning moment can be effected throu hout any desired range of the positions o f t e operating handle.

In the accompanying drawings, illustra/b ing the preferred formand several modifications of luy-invention, Figures 1 and 2 represent in fronteleva'tion, partly in section, two modifications 'of the operating a0 mechanism; Fig. 3' represents the modification of Fig. 2 with the operating lever de flected: Fig. 4 representsthe preferred form of construction in front elevation, partly in section; Fig. 5 represents a partial view of thepreferred form with the operating lever "deflected, and Fig. 6 represents the variation of turning moment produced by the construction shown in Figs. 4 and 5.

' .Referring to the drawings, ,the operating iever c is secured in the usual manner-upon the shaft J1, carrying the oscillatory member of the ignition machine s, and the art i thereof is extended beyond the shaft Into a fork-shaped piece spanned by a pin z upon which the bearing "block z', is rotatably mounted. The block c', is embraced .by the fork-shaped end k of the intermediate mem ber or link Z which carries at the other end the cam a; either integral with it or .rigidly fastened to it. A draft rod m for the spring b is pivotally connected at the middle yof the cam a and passes through an opening in' the fixed abutment e.

In Fig. 1, a short draft rod m connects one end of the `spring b to the cam a, while the adjustable rod n connects the other end of the` spring to a fixed vpart of the ignition machine s.- The rods m and ff.; are provided with enlarged heads m n, resting within the end convolutions of the spring. In Fi 2, the 'adjustable draft rod m exten e through the spring ,b and rests upon a disk o wliich is arranged to slide within'the fixed gui e p.

When the operating lever c is deflected y from its normal position of rest,'shown in Figs..1 and 2, to the position-shown" in Fig.

, 3, the cam a assumes an inclined position,

therebv stressing the spring b. bytensioning it in Fig. 1 and by compressin it in Fig. 2. The spring lthen strongly'v'ten s to snap the cam a and 'the operating lever c back to their normal :positionsI of rest by a pure-- curs as soon asftheoperating leyer is re leased from its deflected position," and the rapidfmovement of the oscillatory member r of the ignition machine s generates :a sparking voltage Suitable fox use indonrolling motion between. the shapedsurface 105 Iof the cam a and fthe coperating shapedlsurface-of the abutment e. This action oc` nection with )ignition systems for igniting the combustible mixtures 'in the internal combustion engines with which the machine is intended to be associated.

5 Figs. 4 and 5 are'like the previous forms of construction except .that the shaped-surface of'the cam a 1s arched, thereby producing a single line of contact when the cam is in its position of rest.V This results in the effect that during a small deflection of the operating lever, as shown in Fig. 5, the turnin moment on the oscillatory member -of the 1 ition machine increases at a comparative y' low rate, while assoon as the curved end ortion of the cam a comes into contact wit the abutment e, the turning moment increases at a higher rate. The characteristic variation of the turning y moment with the' deflection of the operating handle is indicated by Fig. 6, wherein the abcissaa are proportional-to the deflectiom' and the ordlnates are turning moment.

When the operating lever of Fig. l is re-l leased from it fully deflected position, the spring b produces a strong and rapid movement of the oscillatory member r, without the curved portions of the cam a striking violentlylagainst the abutment at any point. In this way the pressure between the con proportional to the up, and only purely rolling friction occurs between them. Furthermore, the stress transmitted to or from the operating lever is in substantially constant direction throughout substantially the entire deflection of the operating lever.

The contact surface at the portion intermediate the ends of the abutment is shown flat in the drawings, merely as an example, while the contact .surface of the cam is shown curved at the ends with a flat or arched intermediate portion. It is apparent, however, that the contour of the co- 45 operating contact surfaces can be'modified in various ways to" accomplish desired results'. For instance, the contact surface of the cam may be flat, and that of the abutment arched.y Also, the contour of one of the coperating surfaces may be concave and the other convex, in which case the convex surface should have the shorter radius. When the arm z' and intermediate member Z are disposed on the op osite side of the shaft It from the part c o the voperating lever, the deflection of ythe'cam a for a given deflection of the operating levery varies di? rectly with the length of the arm i and inversely with the len h of the intermediate member Z. Also, wit la comparatively short arm i, only a part -of the rolling contact surfaces will be utilized, so that the turning moment on the oscillatory member of the i 1t1on machine increases but slowly, while 1 the arm i 1s comparatively long, the tiptact surfaces is mildly and elastically taken` operating spring,

ping action of the cam a occurs after the completion of thle rolling movement, and therefore the turning moment attains comparatively high values, as maybe noted in FIgI. 6. 70

` aving thus describedmy invention, what I claim is:

1. In operating mechanism for oscillatory ignition machines, an operating lever, an operating spring, 'a lixcd abutment, and a cam in rolling engagement with the abutment, the operating loyer being pivotally connected to the cam to displace it by @frolling motion 'when the lever is dellected, and the cam being operatively connected lto the spring to stress it 'when the camis displaced; substantially as described.

. 2. In operating mechanism for oscillatory ignition machines,'an'operatin`g lever, an cperating spring, an abutment having a`,85 shaped-surface, a cam having a. shaped-surfacein'rolling engagement with the shaped surface of the abutment, a draft rod connectedto the spring and pivoted to the cam in such manner/,as to draw the cam into engagement with the abutment, and an oper' ative connection between the cam and the operating lever whereby the deflection of the lever displaces the cam and stresses the spring; substantially as described.'

.3. In operating mechanism for oscillatory ignition machines, an operating` lever, an operating spring, an abutment having a shaped-suriece5acamliaving a shaped-surface in rolling engagement with the shapedsurface of the abutment, av .draft rod connected to the spring and passing through an opening in the abutment toa pivotedv connection near the middle of the cam in such i manner as to draw the cam into engagement with the abutment, and an operative connection between the4 cam and the operating lever whereby thevdeflection of the lever displaces the cam and stresses the spring; substantially as described.

4. In operating mechanism for oscillatory ignitionmachines, an operating lever con' nected to the oscillatory member of the'ig. nition machine, an operating spring, an abutment having a shapedsurfa'ce, a cam 115 having a shaped-surface in rolling engagement with the shaped-surfaceof the abutment, a connection between the spring andl .the cam for holding the cam in engagement with the abutment, and a lever the cam and pivotally connected'to the oper- .ating lever, whereby the deflection of the op 'erating'lever displaces the cam and stresses the spring; substantially as described.

5: operating mechanism` for oscillatory 125 ignitlon machines, an operating lever, an

an abutment having a shaped-surface, and a cam -having a shaped-surface in rolling engagement with the shaped surface of the abutment, said carried by 12o shaped-surfaces engaging along a single line when the cam is in its normal position of rest, and the operating lever being operatively connected to the cam to displace it when the lever is deflected and the cam be o shorter radius than the intermediate portion in rolling engagement 'with the shapedsurface of the abutment, and mechanism interposedbetween the cam and the operating lever and arranged in such manner relatively to the eoperating shaped-surfaces that the cam tips upon one-ot its curved ends after a predetermined deflection of the operating lever; substantially as described, 7. In operating mechanism or oscillatory Sayles et this patent may be obtained tar ignition" machines, an operating lever connected to the oscillatory member of the ignition machine, an operating spring, a fixed abutment having a shaped-surface, a cam having a shaped-surface with curved ends of shorter radius than the intermediate portion and so shaped relatively to the shapedsurface of the abutment as t be in rolling engagement therewith and to have a single line of contact when the operating lever 1sy in its normal position of rest, a draft rod connected to the spring and passing through an opening in the abutment to a pivoted connection near the middle of the cam in such manner as to draw the cam into engagement with the abutment, and a lever carried by the cam and pivotally connected to the operating lever; substantially as described.

in testimony whereof I afxmysignature, in presence of t-Wo' Witnesses.

ROBERT WAGNER.

VVitnesses PAUL WOLFART, HERMANN SGHNEDER.

live cents each, by edel-easing tho--Comn1issioner ofhfentl.

Washington, S., C." 

